Police today confirmed that a man has been arrested in conjunction with the attacks on millionaire David McMillian and his 22-year-old son on 13 March.

David McMillan suffered serious head injuries in a murder bid by three masked men at his £1.7million home in the capital ’s Pitcairn Grove. The trio then fled the scene, and set their getaway car on fire.

McMillan was attacked with a blade and his 22-year-old son, also David, was slashed in the hand after he tried to intervene.

The incident happened around 5.30pm on Wednesday 13 March. Following the arrest the man was released pending further inquiries and the investigation into these attacks is continuing.

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Bradley Welsh murder

It's thought that the attacks could be linked to the fatal shooting of Trainspotting 2 star and local gym owner Bradley Welsh on 17 April. Welsh was shot outside his home in Chester Street in the New Town by an assassin dressed as a jogger, and police are yet to track down the killer.

The Daily Record reported that both Welsh and McMillan knew gangster Mark Richardson, who is in prison for his part in a violent crime gang operating across Scotland.

The gang's car on fire after the incident (Image: Daily Record)

A police source told the Record;

“Bradley was a known friend of Richardson’s and while he stayed away from the criminality involved, it could be his association with Richardson and other criminal connections has cost him his life.

“One of Richardson’s other friends (David McMillan) was attacked in his own home with machetes just recently. It could be his friends are being picked off one by one."

The source added: “It’s no coincidence Bradley and David both knew Mark. This could just be the start of something.”

Police Scotland say that anyone with information about the Pitcairn Grove incident is asked to come forward and quote incident 3117 of the 13th March.